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People did not notice that the sky above them was torn apart. The space-time channel is quietly opening. The aliens are coming! The system called Thousand Realms gives people hope. With its help, contractors can travel through the fantasy world and gain strength. Devil Fruit, Giant Power, Blue Higanbana... All kinds of magical powers have become readily available. "My name is Lin Yu. I originally wanted to be a hero and save the beauty, but I was half successful." "It's fine, girl, I sent it." "Now an inexplicable system wants to sign a contract with me." "And invite me to... Demon Slayer: Kimetsu no Yaiba!"

Huo Qi, a veteran player of the currently discontinued popular holographic game "Youxing" and the number one mechanic on the list, was transported to another world in the game by some mysterious force. Facing the real apocalypse of the game, use the mechanic panel to fight against alien species, transformed humans, psionic users, subspace evil gods, and participate in star-killing and even galaxy-level battles. Firearms, mechas, combat equipment, battleships... Why did I travel here? After possessing powerful mechanical power and becoming a majestic force in the galaxy, Huo Qi began to think about the meaning of life. Damn it, I want to defeat that hanging dog. The story also starts with cheating in the arena... Elements: Great Expedition, psychic energy, subspace, interstellar battle, gang jumping, mecha, human-machine play...